On Anomalously High Photosensitivity of CdS1 –xSex Granular Films

Nefedkin, Nikita; Andrianov, E. S.; Pukhov, A. A.; Виноградов, А. П.; Gurov, S. V.; Boginskaya, I. A.; Sedova, M. V.; Bykov, I. V.; Ryzhikov, I. A.

doi:10.1134/s1064226918110062

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…The altogether synergistic effect thus results in a large voltage responsivity even though the contacts are symmetric. [ 28,51 ] The observed decrease in voltage responsivity with temperature is attributed to the abovementioned increase in the conductance of the TNPs device (Figure 2a). Beyond the transition temperature, both the photoresponse and responsivity decay to nearly 0% due to the metallic state transition.…”

Section: Methodsmentioning

confidence: 96%

Ultrahigh Infrared Photoresponse in Titanium Sesquioxide at Mott‐Insulator Transition

Nandi

Tripathi

Adhikary

et al. 2020

Adv Materials Inter

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tage in collection ability of photocarriers over a wide range from ultraviolet to terahertz wavelengths. Hence, the photoresponsivity for graphene has been limited between 10 −6 and 10 7 A W −1. [13-17] Only TMDs (transition metal dichalcogenides) based photo detectors, e.g., MoS 2 , MoSe 2 , WS 2 , and WSe 2 and VII-TMDs, e.g., ReS 2 and ReSe 2 were reported to exhibit photoresponsivity between 10 4 and 10 7 A W −1 for the radiation wavelength in a limited spectrum range. [18-20] The ability to detect IR in vdW interfaces was further explored by combining ReS 2 and ReSe 2 to achieve a maximum responsivity of 3.64 × 10 5 A W −1 at λ = 980 nm. [21] Overall, vdW photodetectors reported so far pose a difficulty in achieving both the high photoresponsivity and wide range detection together mainly for the IR radiation. Moreover, although IR detection was obtained using several narrow bandgap vdW materials but the photodetectors showed drawbacks such as, slow response speed and environmental instability along with low photoresponsivity (e.g., black phosphorous based heterostructures). [22] Recently, Li et al. reported multifunctional properties in the thin film of titanium sesquioxide (Ti 2 O 3), showing both ferromagnetic and even superconducting nature in their two separate studies. [23,24] Moreover, Ti 2 O 3 has also demonstrated a wide range of IR detection capability (due to a bandgap of ≈0.09-0.1 eV) in conjunction with the graphene due to its surface and interface properties. [25] The conductivity at the interface could possibly be due to the Fermi level pinning in the conduction band, which is unusual with narrow bandgap materials. [25] Pearson in 1958 reported an interesting conductivity transition in Ti 2 O 3 under heating conditions [26] and followed by many other reports. Further, in 1981 Mott indicated occurrence of interesting metal−insulator transition in Ti 2 O 3 at 400 K. [27] So far there are no reports on exploiting IR detection capability of Ti 2 O 3 at its transition temperature. Our study provides an exceptional phototransition in granular Ti 2 O 3 upon IR illumination during its transitional state. We report an abrupt enormously large increase in the photoresponsivity for the IR radiation that further provides a deep insight into the transition phenomena in Ti 2 O 3 at 400 K.

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Section: Methodsmentioning

confidence: 96%

Ultrahigh Infrared Photoresponse in Titanium Sesquioxide at Mott‐Insulator Transition

Nandi

Tripathi

Adhikary

et al. 2020

Adv Materials Inter

View full text Add to dashboard Cite

show abstract

“…One of the disadvantages of these technologies is the high cost of equipment and the labor intensity of technical processes. In this regard, the current scientific and technical task is to create a lowcost technology for obtaining materials without quality losses (functional properties) [5,6]. One way to solve this is to obtain polycrystalline films A 2 B 6 of high quality using alternative, cheaper technologies, such as the method of spraying a suspension supplemented by additional heat treatment, chemical precipitations from solutions, or using various printing methods (screen, jet, and die stamping).…”

Section: Introductionmentioning

confidence: 99%

Morphological Features of Polycrystalline CdS1−xSex Films Obtained by Screen-Printing Method

et al. 2023

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The results of studying the morphological peculiarities of polycrystalline CdS1−xSex films, obtained by screen printing, with well-formed grain boundaries of high structural quality are presented here. The developed method for screen printing provides the formation of polycrystalline films of a specified area per cycle, provided that there is a possibility for varying their thickness from tens of microns to units, which allows reducing the solar cell’s thickness and facilitating the process of its connection with the substrate. Therefore, the application of the films to a sitall substrate by screen printing contributes to reducing the product weight and facilitating the process of joining sheet materials intended for solar panels, namely attaching the lasing element to the substrate. The purpose of this work is to study the morphological peculiarities of polycrystalline CdS1−xSex films obtained by an optimized screen-printing method and to create a model of their formation process. The structural and morphological peculiarities of the samples were studied using electron microscopy, AFM, XPA, and XFS. As a result of the work, based on the obtained experimental data, a model of the film formation process was developed. The model validity is justified by the conformity of the data of the experiment performed on its basis.

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On Anomalously High Photosensitivity of CdS1 –xSex Granular Films

Cited by 2 publications

References 17 publications

Ultrahigh Infrared Photoresponse in Titanium Sesquioxide at Mott‐Insulator Transition

Ultrahigh Infrared Photoresponse in Titanium Sesquioxide at Mott‐Insulator Transition

Morphological Features of Polycrystalline CdS1−xSex Films Obtained by Screen-Printing Method

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